Abstract
In this paper, we study generation of Bessel beams from semiconductor lasers with high beam propagation parameter M2 and their utilization for optical trapping and manipulation of microscopic particles including living cells. The demonstrated optical tweezing with diodegenerated Bessel beams paves the way to replace their vibronic-generated counterparts for a range of applications towards novel lab-on-a-chip configurations.
Highlights
Optical trapping and tweezing technique is based on the forces that arise as a consequence of the law of conservation of momentum in the absorption, reflection and refraction of the laser beam at the particle [1]
Optical trapping with Bessel beams generated from semiconductor lasers In this paper, we demonstrate the use of the Bessel beams generated from the laser diodes for optical trapping and manipulation of microscopic particles including living cells which build on our recent results reported elsewhere [19]
The properties of Bessel beams generated from laser diodes with high beam propagation parameter М2 and their applications to optical tweezers are discussed
Summary
Optical trapping and tweezing technique is based on the forces that arise as a consequence of the law of conservation of momentum in the absorption, reflection and refraction of the laser beam at the particle [1]. In order to trap the microparticle, one must sharply focus the laser light This significantly reduces the workspace due to diffraction: tighter focusing results in faster divergence of radiation, and the problem can not be resolved in terms of the Gaussian optics. As was shown in the seminal work by Durnin [2] (and earlier by Zeldovich et al [3]) diffractive divergence can be almost completely eliminated with a special class of non-diffracting light fields called Bessel beams This class of propagation-invariant beams is generated through the interference of the conically converging rays taking place when a collimated Gaussian beam transits a cone-shaped lens (axicon [4]).
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